There are a few signs that may indicate a need to change your brake fluid:

1. Spongy Brake Pedal: If the brake pedal feels soft or spongy when pressed, it could be due to air or moisture in the brake fluid. This can affect brake responsiveness.
2. Reduced Braking Performance: If you notice a decrease in braking power or longer stopping distances, it might indicate deteriorated brake fluid.
3. Brake Fluid Color: Fresh brake fluid is usually clear or slightly amber. If the fluid appears dark or murky, it’s an indication that it’s time for a change.
4. Warning Light: Some vehicles have a dashboard warning light that may illuminate if there’s an issue with the brake fluid level or quality.
5. Brake Fluid Level: If the brake fluid level in the reservoir consistently drops, it could be a sign of a leak or fluid degradation.
6. Unusual Noises: Air or moisture in the brake fluid can cause noise when braking, such as a grinding or squealing sound.
7. Long Time Since Last Change: If it’s been more than 2-3 years since your last brake fluid change, it’s a good idea to have it inspected and possibly replaced.

Regular maintenance and periodic checks of your brake fluid can help ensure the safety and reliability of your vehicle’s braking system. If you notice any of these signs, consider having your brake fluid checked and replaced by a professional mechanic.